. >> the most heated moment came during ron johnson's questioning. he wanted know why it took so long for the administration to back off from the original story from the attack in libya was a result of a spontaneous protest. listen. >> again, we were mislead there were supposedly protest and something sprang out of that. assault sprang out of that. that was easily ascertained that was not the fact and the american people could have known that within days. and they didn't know that. >> with all due respect. the fact is we had four dead americans. was it because of a ro test or guys out for a walk one night and decided this would he go kill some americans. what different, at this point, does it make? it is our job to figure out what happens and do everything we can to prevent it from ever happening again, senator. >> senator john mccain saying her responses were not good enough. that exchange was quite civil and polite. secretary clinton took full responsibility for the lack ever adequate security in her opening statement, which brought her to tears. >